Example: Heat exchanger

A heat exchanger $(Hx)$ is operating at steady state. Steam enters one stream of the $Hx$ at $250[kP]$ and $90\%$ quality and exits at the same pressure as a saturated liquid. Liquid oil enters the other stream of $Hx$ at $29\mathrm{.}0[k\frac{g}{s}]$ at $[20C\}$ and exits as as a liquid at $100[C]$ with negligible pressure change. Kinetic and potential energy effects can be neglected

The oil can betreated as an incompressible liquid with a constant specific heat of $2\mathrm{.}0\frac{KJ}{KgK}$

$10\%$ of the energy transferred to the oil is lost to the surrounding air through stray heat transfer. There is no heat transfer between

waterside of Hx

Determine the mass flow rate of water through $Hx$